Clamp



(No Model.) l

A. NACRE & A. BRINKMANN. y

CLAMP. No. 437,403. y Patented Sept. 30, 1890*.;

UNITED STATES PATENT OFFICE.

ARNoLD NACRE AND ALBERT RRINKMANN, or PHILADELPHIA,

PENNsYLvANIA.

CLAM P.

i SPECIFICATION forming part of Letters Patent No. 437,403, datedSeptember 30, 1890.

Application led January 16, 1890. Serial No. 337,132. (No model.)

.To a/ZZ whom it may concern:

Beit known that'we, ARNOLD NACRE and ALBERT BRINKMANN, citizens `of theUnited States, residing at Philadelphia, in the county of Philadelphia.and State of Pennsylvania, United States of America, have inventedcertain new and useful Improvements in Clamps, of which the following isa full, clear, and exact description.

The aim of our invention is to provide a simple and inexpensive clampwhich may be quickly adjusted and secured, and which shall be withoutsprings or other parts liable to become inoperative.

In the accompanying drawings, Figure l is a perspective view of ourclamp. Fig. 2 is a side view of the same with the movable jaw partly insection.

Referring tothe drawings, A represents a straight bar or stock withsmooth edges and with a rigid jaw ct extending at right angles from oneend.

Bis the movable jaw, having an opening or mertise through one end toadmit the bar A, on which it slides. Near its rear side the movable jawis provided with the hardenedsteel bearing-plate a,seated in arecesstherein and arranged to bear on a hard-metal plate a2, which is extendedthrough the opening in the jaw and arranged to slide on the edge of barA. Against the opposite edge of the bar there is a second bearing-platee, also extended through the movable jaw and recessed to receive the endof a hand-screw d, tapped into the jaw near its forward side. Each ofthe bearing-plates has its ends widened or extended laterally beyond theopening in the jaw, as shown, these widened or shouldered ends servingto carry the plates along the bar with the jaw and to prevent them fromsliding endwise out of the latter.

In assembling the-parts the plates are rst inserted into the jaw andturned down to their places and the bar A inserted between them,whereupon it acts to prevent the plates from escaping under anycircumstances. A screw g in the end of the bar prevents the accidentalescape of the jaw.

In operating the clamp the movable jaw is carried forward until theobject to be held bears against both jaws, after which a partialrevolution of the screw is sufficient to lock the parts securely and t-oapply a pressure to the object. As the screw is turned inward it acts totip the movable jaw on the plate a as a fulcrum toward its companion.The pressure of the jaw and the screw causes the bearing-plates toengage securely with the bar A, so that the jaw is held Iirmlyinposition and the edges of the bar protected from the mutilation which itwould otherwise receive from the screw and the plate a.

The groove shown in the interior wall is intended to afford an increasedopening to facilitate the introduction of the bearing-plate e before thebar A is passed through the movable jaw. p

1. Inaclamp,thebarA,having thelixedjaw, in combination with the slidingjaw through which the bar A extends, the. two bearingplates seatedwithin the jaw and enlarged at the ends to prevent their escape, and thehand-screw seated in the jaw and acting against the outer plate.

2. In combination with the bar with the fixed jaw, the mortised slidingjaw, the plate a' seated therein, the loose plate a2, extended throughthe jaw and widened at the ends to v ARNOLD NACKE. ALBERT BRINKMANN.

Vitnesses:

AWILLIAM J. KELLY, HAROLD E. COBB.

